Drill-operating mechanism.



J. D. MACDONALD, DECD.

r. c. MACDONALD. ADMINISTRATOR.

DRILL OPERATING MECHANISM. APPLICATION-FILED JUNE 10, 19M. RENEWED UEC.23,1915.

Patented July 2", 19 16.

2 SHEETS-SHEET I.

J. D. MACDONALD, DECD.

r. c. MACDONALD, ADMINISTRATOR.

DRILL OPERATING MECHANISM. APPLICATION HLED JUNE I0. 1911.

RENEWED DEC. 23. 1915.

Patented July 20, 1916.

2 SHEETS-SHEET 2.

JOSEPH D. MACDONALD, OF BUTTE, MONTANA; FRANK C. MACDONALD, ADMINIS-TRATOR OI? SAID JOSEPHD. MACDONALD, DECEASED, ASSIGNOR OF ONE-HALF TOCATHRINE MACDONALD AND ONE-HALF TO FRANK C. MACDONALD, BOTH OF SANFRANCISCO, CALIFORNIA.

Specification of Letters Patent.

Patented July 25, 191%.

Application filed June 10, 1911, Serial No. 632,435. Renewed December23, 1915. Serial No. 68,459.

To all whom it may concern:

Be it known that I, JOSEPH D. MAO- Dormno, a citizen of the UnitedStates, reslding at Butte, in the county of Silverbow and State ofMontana, have invented. certain new and useful Improvements in Drill-Operating Mechanisms, of which the following is a specification.

My present invention pertains to an improved apparatus or mechanism forimparting an oscillating movement to the feed bar of a drill, and at thesame time and through the same mechanism to moisten the compressed airwhich is fed to the drill or drill-hammer, the mechanism being operatedby the compressed air.

The structure is illustrated in the annexed drawings, wherein:

Figure 1 is a perspective view of the mechanism; Fig. 2 a verticalsectional view, taken on the line 2-2 of Fig. 3, and looking in thedirection of the arrow; Fi 3 a similar view, taken on the line 33 0 Fig.2; and Fig. 4 is a detail sectional view illustrating the drill-bar orcylinder and the connections by which it is oscillated.

The main object of the present invention is to provide a' suitablemechanism which, through the use of compressed air or other pressurefluid, may be employed to oscillate a drill-bar, and also to providemeans whereby the compressed air which is fed to the pneumatic hammermay be moistened to a greater or less extent, thereby preventing theblowing of dust out of the hole which is being drilled. The use of themoistened air is also advantageous in the operation of the drill whenworking upon various grades of material.

' The invention in its broadest sense may be said to comprise a powercylinder or engine which actuates the oscillating member that supportsthe drill-bar, and likewise actuates a force pump to aspirate water intothe compressed air which is fed or passedonto the hammer.

Referring to the drawings, 1 denotes the power cylinder providedadjacent to its upper head 2 with a flanged extension or socket member5, adapted .to coact with a sim lar member 6, to clamp and embrace theordinary supporting bar 7 carried by a tripod or otherwise suitablysupported.

. The cylinder 1, which in effect is the cylinder of the motor whichoperates the oscillating member and the aspirating pump, may contain amotor of any approved type, but for the purposes of illustration and asshowing a construction which has actually been used and found eflicient,a description of the motor shown in Fig. 2 will now be given. It may besaid to consist of a piston having two heads, 8 and 9, connected by acylindrical member or stem 10,. in the upper end of which is secured apiston-rod 11, said rod extending through the head 2 and a packing gland12 mounted thereon. The stem 10 is hollow and secured in the lower endthereof is an exhaust pipe 13, said pipe extending through a smilingbox13 in the lower head of the cylinder. The stem is also provided with alateral port 14. A channel 15 extends through the stem 10 from the upperend thereof down toward the lower head 8 and terminates in a lateralport 16, a second port, 17, likewise opening into said channel 15 at apoint above the lower port 16. A similar channel 18 extends through thelower head 8 of the piston upwardly through the stem 10, terminatingshort of the upper head 9 and being provided with a. lateral port 19 andwith a second lateral port 20, said ports 19 and 20 occupying the samerelative positions to the channel 18 as do the ports 16 and 17 to thechannel 15.

Mounted upon the stem 10 of the double piston is a spool-shaped valvehaving heads 21 and 22. The body of the spool, upon its inner face, orthat which contacts with and slides over the stem 10, is provided withan elongated annular recess or chamber 23, and likewise with ports 24:upon opposite sides thereof, said ports opening into an internalcircumferential groove or channel 25. Ports 26, located adjacent to thelower head 21 and occupying the same relation thereto as the ports '24to the head 22, are formedin the body of the spool and open into anmternal circumferential groove or channel 27.

The compressed air for actuating the motor passesinto the same through aport '28 located at the midlength of the cylinder 1. The operation ofthe motor is as follows:

. Assuming that the parts are in the positions shown in Fig. 2,compressed air entering the port 28 passes in between the heads 9 and22, thence through the port 19, down the channel 18 and below the lowerhead 8, the air acting upon the .under .face of the head 8 and againstthe fixed lower vhead of the cylinder and tending to force the pistonand the valve upwardly. During this upward motion the air above thepiston-head 9 will pass downwardly through the channel 15, out throughthe lateral port 17 into the chamber 23, thence'through the port 14 intoth hollow stem 10 and through the exhaust pipe 13. The impetus of theparts will carry the valve-head 22 past the inlet-port 28 a d the airwill then pass into the chamber ormed between. the heads 21 and 22 ofthe spool-shaped valve through the ports 24,

' into the channel 25, and thence through the port 20 into the ehannel18, and the piston will continue its upward movement. When it reachesthe limit of its upward travel, the valve will shift, owing to theimpetus of the valve, and a reverse motion will be effected. At suchtime the head 21 of the valve will be separated from the head 8 and thea r will pass from the port 28 between said heads through the port 16and upwardly above the head 9 of the piston, through the channel 15. Solong as the air continues to pass into the port 28, or in other words,so long as .the flow of air is not interrupted, the motor will continueto act.

Secured to the upper face of the member 3 is a combined support andhousing for the oscillating clamp or chuck in which the drillbar ismounted, which support and housing form a guide for the combinedrack-bar and movable cylinder of the aspirating pump. Said combinedsupport and'housing preferably takes the form of a rectangular boxi likemember, 29, the rear wall of which .with a gear 32 keyed to sleeve 33.

forms a bearing for the rear face of the combined rack and cylinder 30.aid mem: her, as will be clearly seen upon reference to Fig. 2, isthreaded on the upper end of the piston-rod 11, and is provided on itsforward face with a rack 31, which meshes Said sleeve finds its bearingin laterally-extending hubs or extensions of the housing, designated by34 and 35. A nut 36 is threaded upon one end of the sleeve (see Fig. 3)and bears against the outer end of the hub 35. The opposite end of thesleeve is provided with an enlarged head 37, the inner wall of whichbears against the outer end of the hub 34. It will thus be seen that noendwise movement of the hub in its bearings cantake place and that thegear 32 will likewith the rack 31. The interior face of the head isthreaded and two semicircular clamping plates 38, 39, externallythreaded, are seated in said head and forced down wardly upon thedrill-bar or cylinder 40 by suitable set-screws 41, 42. The threadedengagement of the clamping plates prevents longitudinal displacementthereof with reference to the head when the set-screws are loosened forthe purpose of adjusting the drill-bar longitudinally therethrough.

Rigidly secured to the top 43 of the housing 29 is a hollow piston-rod44, said rod extending through a stuffing-box 45 into the upper end ofthe cylinder 30.- Said hollow rod 44 is connected through a suitablecoupling 46 with a pipe 47 which in turn is in communication with a pipe48. Said pipe is connected with a water supply pipe 49 and a.check-valve 50 is interposed between said supply pipe and the pipe 48. Asecond check-valve 51 is likewise secured to the pipe 48 above the pointof connection of the pipe 47, said check-valve working in a directionopposite to that of the check-valve 50. A- flexible pipe 52 (preferablya section of rub-- ber hose) extends from the check-valve around to athree-way coupling 53. i

The main air-supply pipe, leading from any suitable source of pressure,is designated by 54 andterminates in a three-way coupling 55, from whichextends a pipe 56 con-' nected to the coupling 53, a valve 57,preferably a three-way valve, being located in said pipe 56. .A flexiblepipe 58 extends from the coupling 53 to the rear end of the drill-bar orcylinder 40 and, as is usual in this class of machinery, opens into theend of the drillbar in rear of the piston 40 mounted therein, and towhich piston is secured a hollow rod 40 to the outer end of which theengine or hammer 40 is directly connected. Said hammer is preferably ofthe type shown in my copending application Serial No. 616,199, filed onor about March 22nd, 1911, and the air which is forced into said barpasses through the rod and through the ports formed in the hammer andthence through the openings in the drill 40 to the bottom of the holewhich is being made by the drill: A pipe 59 extends downwardly from thecoupling 55 and is connected with a pipe 60 mounted in the casing and inthemember 3, said pipe opening into the port 28. A threeway valve 61will preferably be placed in the pipe 59. The water pipe 49 willterminate in a tank or any other supply of water. The action of theapparatus is as follows:

Assuming that the motor has drawn the I wise be held in its properposition in mesh 47, coupling 46, piston-rod 44 and into the cylinder,as the motor moves the rod 11 upwardly it carries the combined cylinderand rack with it, thereby rotating the gear 32 and consequently rotatingthe drill-bar or cylinder 40. At the same time, the water will be forcedout of the cylindrical member 30, through the rod 44, coupling 46, pipe47, and upwardly past the check valve 51 which is then raised from itsseat, the checkvalve 50 being at such time forced to its seat to preventretrograde movement of the water. The water which is forced out past thecheck-\alve 51 will pass through the pipe 52 and come into contact withthe air which at that time is passing through the pipes hereinbeforcdescribed, and will be carried along with the air through the pipe 58into the drill-rod or dri1l-bar, through the motor or 1 engine, anddischarged in an aspirated condition through the opening in the outerend of the drill, being thereby discharged into the bottom of theopening being formed. It will thus be seen that for each upward anddownward movement of the rod 11, the rack will actuate the gear 32, andin turn oscillate the bar &0, and at the same time a quantity of waterwill be drawn in by the pump, comprising the cylindrical member 30 andthe fixed piston-rod 44, and discharged into the air-line which lends tothe hammer.

The amount of air which passes to the motor for the'drill may beregulated by manipulation of the valve 57, and the amount of airpassing-to the motor may likewise be controlled by manipulation of thevalve 61.

The motor may be lubricated by turning the valve 61 to such position asto cut oil the air-supply and open the valve outwardly through a port62, at which time oil may be fed into the pipe 60, through which pipe itwill pass by gravity into the motor.

' lVhen it is desired to oil the mechanism contained in the drill-barand also the motor connected to the outer end of the drill-bar the valve57 will be turned so as to cut oil the air-supply and to open the valveoutwardly through a port 57, oil being introduced through said port intothe pipe 56, whence it passes through the coupling 53, pipe 58, into thedrill-bar and the parts carried thereby.

The attachment of the pipe 48 to the lower end of the pipe 4.7 ispreferably made through a swivel connection, the construction shownbeing merely a T, threaded upon the lower end of the pipe 17 or theelbow carried thereby. This construction permits the machine as a wholeto be placed at any inclination from the vertical about the bar 7, whilemaintaining the check valves 50 sired angle, this by reason of the factthat it may be swung about the supporting memher 7 and also be turned inthe clamping members when said members are released.

Having thus described my invention, what I claim is:

1. In an apparatus of the character specified, the combination of adrill-bar; a pneumatic hammer carried thereby; an oscillating clamp forsupporting said bar; an airline leading to the hammer; a pump adapted toforce water'into said air-line; and a motor for actuating the pump andoscillating the clamp.

2. In an apparatus of the character specified, the combination of adrill-bar; a pneumatic hammer carried thereby; an oscillating clamp forsupporting the drill-bar; an

air-line leading to the hammer; a pump adapted to force water into theair-line; a motor for actuating the pump and oscillating the clamp; andmeans for securing the mechanism as a unitary structure upon a suitablesupport.

3. In an apparatus of the character specified. thecombination of adrill-bar; a pneumatic hammer carried thereby; an oscillating clampsupporting and clamping said bar; and a motor for imparting motion tosaid clamp.

4. In an apparatus of the character specified, the combination of adrill-bar; a pneumatic hammer carried thereby; an osci1lat ing clamp forsupporting said bar and through which it maybelongitudinally ad justed;an air-line leading to the hammer; a pump for forcing water 'into theair-line of the hammer; and a motor for actuating the pump andoscillating the clamp.

5. In an apparatus of the character specified; the combination of asuitable housing; an oscillating drillbar clamp; a drill-bar mounted insaid clamp; a pneumatic hammer carried by said bar; an airline leadingto the hammer; a pump likewise supported by the housing and dischargingwater into the air-line leading to the hammer; and a motor secured tothe housing and actuating the clamp and pump.

6. In an apparatus of the character specitied, the combination of asuitable housing; an oscillating drill-bar clamp mounted therein; adrill-bar carried by the clamp; a pneumatic hammer carried by the bar;an

air line leading to the hammer; a motor ling the inlet and exhaust ofwater to and from the pump formed by the piston and rack-bar, theexhaust terminating in the airline leading to the hammer.

7. In an apparatus of the character specified, the combinationofasuitable housing;-

a drill-bar clamp carried'thereby; a drillbar; a pneumatiq hammercarried by the bar; an air-line leading to the hammer; a motor securedto the housing; a pump mounted in the housing; connections intermediatethe motor, the clamp and the pump; and a Valve mechanism swiveled uponthe housing and serving to control the flow of 10 water into and fromthe pump, the pump exhaust terminating in the air-line leading to thepneumatic hammer.

In testimony whereof -I have signed my name to this specification in thepresence of two subscribing Witnesses.

JOSEPH D. MACDONALD.

VVitnessesz- C. F. CHAPIN, M10. 0. OALLAHAN.

